Muffin pan



FIG. 1 is a perspective view of the muffin pan, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof, the rear elevational view, the right side elevational view, and left side elevational view being the same; and,

FIG. 4 is a bottom plan view thereof. 

CLAIM I claim the ornamental design of a muffin pan, as shown and described. 